Size-dependent change in interband absorption and broadening of optical plasma-resonance absorption of indium particles

Abstract

Copyright 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in E. Anno and M. Tanimoto, Journal of Applied Physics 98(5), 053510 (2005) and may be found at http://link.aip.org/link/?jap/98/053510. publisherOptical absorption of indium-island films, consisting of indium particles smaller than about 500Å in diameter, has been investigated experimentally. The interband absorption, the position of which is almost constant (at about 234 nm) irrespective of particle size, was found to disappear in particle sizes below about 200Å in diameter. This disappearance is pointed out to be similar to that in lead particles, where the disappearance is due to the effect of surface atoms. Optical plasma-resonance absorption appeared at 276-335 nm. By simulating this absorption with a Maxwell-Garnett-type effective-medium theory, we investigated the relaxation time τ and the mean free path l of conduction electrons. Τ and l for particle sizes of about 120 and 160Å in diameter are estimated to be (3.33-3.36)×10^<-16> s and 5.79-5.85Å, respectively, which is smaller than the bulk values (0.38×10^<-14> s and 66.1Å). The small τ and l are attributed to the scattering of the conduction electrons at lattice defects internal to the particles

Size-dependent change in energy bands of nanoparticles of white tin

“…10 This shift was found, for example, for Al and In island films. 11,12 The decrease in the weight thickness from the film in Fig. 1͑a͒ to the film in Fig.…”

“…The reason may be that such interband absorption is very weak and thus difficult to detect because of the overlap with interband absorption 1-3. In the case of In particles, 12 weak interband absorption at about 1.4 eV ͑885 nm͒ was difficult to detect. Electron-diffraction patterns of compounds were not found for samples in the present study ͑Sec.…”

External quantum efficiency response of thin silicon solar cell based on plasmonic scattering of indium and silver nanoparticles

“…This study fabricated solar cells with indium (In) NPs [ 14 , 15 ] on the front surface and Ag NPs on the rear surface. We then examined the degree to which photovoltaic performance was enhanced by the plasmonic scattering of In NPs and Ag according to external quantum efficiency (EQE) and measurements of photovoltaic current–voltage (I-V).…”

In situ spectroscopic ellipsometry to monitor surface plasmon resonant group-III metals deposited by molecular beam epitaxy

“…We characterize the particle size and shape by employing an average in-plane diameter, as demonstrated in other works. 18 Both the transverse and longitudinal modes redshift with increasing particle width-though the longitudinal mode shown for the 276 ML In deposition is beyond the in situ measurement range, we observed it in the ex situ measurement, which extends to 0.75 eV. The ͗ 2 ͘ spectrum for In particles acquired after air exposure reveals that the transverse plasmon mode is significantly damped due to oxidation.…”